Welcome on piarc.org!

PIARC (World Road Association), founded in 1909 and comprising 125 member governments from all over the world, is the global forum for exchange of knowledge and experience on roads, road transport policies and practices. With consultative status to the Economic and Social Council of the United Nations, the Association is contributing to a stable and sustainable global development of the road and transport sector.

This site uses cookies to optimize its operation. They allow you to securely access your personal space and download our publications. You accept their use by clicking on the "Accept" button.

Term of the Road Dictionary

air pollution

  • Language : PIARC Road Dictionary / English
  • Theme : Environment Environmental Protection
  • Definition : Degradation of air quality resulting from unwanted chemicals or other materials occurring in the air. Note: usually the presence of substances in the atmosphere resulting from either human activity or natural processes. These substances are present in sufficient concentration, for a sufficient time and under circumstances that cause them to interfere with the comfort, health or welfare of persons or the environment [ISO 4225/PIARC].

Back to theme